Litter box



FIG. 1 is a top, front and right side perspective view of a litter box showing my new design;

FIG. 2 is a top, rear and right side perspective view of the litter box;

FIG. 3 is a bottom, front and right side perspective view of the litter box;

FIG. 4 is an exploded view of the litter box; and,

FIG. 5 is a cross-sectional view taken along line 5-5 on FIG. 1.

The broken lines in FIGS. 1-5 depict environmental subject matter and form no part of the claimed design. The left side is not claimed. 

CLAIM The ornamental design for a litter box, as shown and described. 